YASKAWA SGD7S series Product Manual page 196

Warning Number:
Possible Cause
Warning Name
The difference
between the
clearance offset
reference and gap
exceeded Pn6F0
(Clearance Posi-
tion Deviation
Overflow Level).
A.90b:
Wiring of the gap
Clearance Position
sensor is incor-
Deviation Overflow
rect.
A failure occurred
in the gap sensor.
A failure occurred
in the SERVO-
PACK.
The wiring is not
correct or there is
a faulty contact in
the motor or
encoder wiring.
Operation was
performed that
exceeded the
overload protec-
tion characteris-
tics.
A.910:
An excessive load
was applied
Overload (warning
during operation
before an A.710 or
because the Ser-
A.720 alarm occurs)
vomotor was not
driven because of
mechanical prob-
lems.
The overload
warning level
(Pn52B) is not
suitable.
A failure occurred
in the SERVO-
PACK.
Abnormal vibra-
tion was detected
during motor
operation.
The setting of
Pn103 (Moment of
A.911:
Inertia Ratio) is
Vibration greater than the
actual moment of
inertia or was
greatly changed.
The vibration
detection level
(Pn312 or Pn384)
is not suitable.
Confirmation
Operate the system so that
Check the amount of
Pn6F0 is not exceeded. Or,
deviation during clear-
set Pn6F0 to the optimum
ance control.
value.
Check the wiring of the Correctly wire the gap sen-
gap sensor. sor.
Check the output volt-
Replace the gap sensor if
age from the gap sen-
the output is not correct.
sor.
The SERVOPACK may be
– faulty. Replace the SERVO-
PACK.
Make sure that the Servo-
Check the wiring. motor and encoder are cor-
rectly wired.
Check the motor over- Reconsider the load and
load characteristics and operating conditions. Or,
Run command. increase the motor capacity.
Check the operation
Remove the mechanical
reference and motor
problem.
speed.
Check that the overload
Set a suitable overload
warning level (Pn52B) is
warning level (Pn52B).
suitable.
The SERVOPACK may be
– faulty. Replace the SERVO-
PACK.
Check for abnormal
motor noise, and check Reduce the motor speed.
the speed and torque Or, reduce the servo gain
waveforms during oper- with custom tuning.
ation.
Set Pn103 (Moment of Iner-
Check the moment of
inertia ratio or mass tia Ratio) to an appropriate
ratio. value.
Check that the vibration Set a suitable vibration
detection level (Pn312 detection level (Pn312 or
or Pn384) is suitable. Pn384).
9.2 Warning Displays
9.2.2 Troubleshooting Warnings
Continued from previous page.
Correction Reference
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page 5-36
page 5-11
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Continued on next page.
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